---
title: 'POST /projects/{project}/topics/{topic}:publish'
description: 'Publish messages'
---

# POST /projects/{project}/topics/{topic}:publish

Publish messages

| Detail | Value |
|---|---|
| Operation ID | `cloud.publishMessages` |
| Method | `POST` |
| Path | `/projects/{project}/topics/{topic}:publish` |
| Connector | [Google Cloud Pub/Sub](./) |

## Parameters

_No parameters._

## Using this endpoint in a workflow

1. Add an **API Call** node to your workflow.
2. Pick your Google Cloud Pub/Sub connection from the Connection dropdown.
3. In the Operation dropdown, select `cloud.publishMessages`.
4. Fill in the parameter fields that appear. Use `{{...}}` to reference upstream values.

## What it returns

The `API Call` node writes the response to the workflow context:

```
{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}
```

Reference response fields downstream as <code v-pre>{{nodeId.data.path}}</code>. The exact response shape is documented on the upstream Google Cloud Pub/Sub API reference.